I ordered and received a Sigma 50 Art and it had completely inconsistent focusing on my 70D when focusing through the view finder (contrast AF). It is however, a simply stunningly amazing sharper than a razor lens when using DPAF. My use case for the lens is wide open using the view finder, so despite perfect focusing with DPAF, it's now how I'd use the lens. I was talked into by the vendor sending it back and exchanging it for another copy, though after reading forum posts I don't have much hope in this solving the issue. The forums seem to say it will either AF on a body or it won't. So my question is, will it AF significantly better on a 7D ii than it will a 70D? There are some upgrades (and some minues too) on the 7dii that I think I'd be willing to spend the money if I knew the 50 Art would focus flawlessly on. As an aside, the 50 Art that I just sent back, focused perfectly on a 6d of a friends.